How Long Do I Have To Pay Spousal Support In Illinois? Besides other financial matters that a divorcing couple has to address, spousal support can be the most contentious out of them all. In Illinois, a Palatine divorce lawyer will tell you that spousal support or alimony duration depends on the length of the marriage. If you or someone you know wishes to get a divorce and are confused about the spousal support you should get or give, call the Law Office of Fedor Kozlov, P.C. for a consultation. in Lawyerwith spousal-support-attorneys